From 1981 to 1993, Danzig was a partner in the Washington, D.C. office of the international law firm Latham & Watkins. He served as Deputy Chair of the firm's International Practice Group, and also as Director of its Japan Group. He was also a Director of the National Semiconductor Corporation, a Trustee of Reed College, and interim Director of Litigation and then Vice Chairman of the International Human Rights Law Group. During this time, Mr. Danzig was co-author, with the distinguished policy analyst Peter Szanton, of the book, National Service: What Would It Mean?

A decade before, Szanton had been head of the New York City-RAND Institute, a joint venture of the City and the RAND Corporation when Danzig came to that office as a law student. The book which Danzig and Szanton co-authored helped shape America's current civilian National Service system.